ENGCOM-6361: No marginal white space validation added #25808

Author: VladimirZaets

app/code/Magento/Cms/Test/Unit/Controller/Adminhtml/Block/SaveTest.php

@@ -373,6 +373,58 @@ public function testSaveAndClose()
         $this->assertSame($this->resultRedirect, $this->saveController->execute());
     }
 
+    public function testSaveActionWithMarginalSpace()
+    {
+        $postData = [
+            'title' => 'unique_title_123',
+            'identifier' => '  unique_title_123',
+            'stores' => ['0'],
+            'is_active' => true,
+            'content' => '',
+            'back' => 'continue'
+        ];
+
+        $this->requestMock->expects($this->any())->method('getPostValue')->willReturn($postData);
+        $this->requestMock->expects($this->atLeastOnce())
+            ->method('getParam')
+            ->willReturnMap(
+                [
+                    ['block_id', null, 1],
+                    ['back', null, true],
+                ]
+            );
+
+        $this->blockFactory->expects($this->atLeastOnce())
+            ->method('create')
+            ->willReturn($this->blockMock);
+
+            $this->blockRepository->expects($this->once())
+            ->method('getById')
+            ->with($this->blockId)
+            ->willReturn($this->blockMock);
+
+        $this->blockMock->expects($this->once())->method('setData');
+        $this->blockRepository->expects($this->once())->method('save')
+            ->with($this->blockMock)
+            ->willThrowException(new \Exception('No marginal white space please.'));
+
+        $this->messageManagerMock->expects($this->never())
+            ->method('addSuccessMessage');
+        $this->messageManagerMock->expects($this->once())
+            ->method('addExceptionMessage');
+
+        $this->dataPersistorMock->expects($this->any())
+            ->method('set')
+            ->with('cms_block', array_merge($postData, ['block_id' => null]));
+
+        $this->resultRedirect->expects($this->atLeastOnce())
+            ->method('setPath')
+            ->with('*/*/edit', ['block_id' => $this->blockId])
+            ->willReturnSelf();
+
+        $this->assertSame($this->resultRedirect, $this->saveController->execute());
+    }
+
     public function testSaveActionThrowsException()
     {
         $postData = [

app/code/Magento/Cms/view/adminhtml/ui_component/cms_block_form.xml

@@ -105,6 +105,7 @@
             <settings>
                 <validation>
                     <rule name="required-entry" xsi:type="boolean">true</rule>
+                    <rule name="no-marginal-whitespace" xsi:type="boolean">true</rule>
                 </validation>
                 <dataType>text</dataType>
                 <label translate="true">Identifier</label>